.box1{
    width: 100px;
    height: 100px;
    background-image: url('../image/1.jpg');
    background-repeat: center no-repeat;
}

.box2{
    width: 100px;
    height: 100px;
    background-image: url('../image/2.jpg');
    background-repeat: no-repeat;
}

.box3{
    width: 100px;
    height: 100px;
    background-image: url('../image/3.jpg');
    background-repeat: no-repeat;
}

.box4{
    width: 100px;
    height: 100px;
    background-image: url('../image/3.jpg');
    background-repeat: no-repeat;
}